Which of the following does not reflect the action of an effector molecule on the transcription of a gene?
A. An effector binds to a repressor to decrease the level of transcription.
B. An effector binds to a repressor to increase the level of transcription.
C. An effector binds to an activator to increase the level of transcription.
D. An effector binds to a polymerase to increase the level of transcription.
D
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The botulinum toxin, which causes botulism, reduces the synaptic release of _____
A) acetylcholine B) epinephrine C) endorphin D) nitric oxide E) gamma-aminobutyric acid (GABA)
Which two groups of primates share the closest relatedness?
a. Chimpanzee and hominids b. Lemurs and Old World monkeys c. Tarsiers and orangutans d. Orangutans and Old World monkeys e. Gibbons and hominids
Cells with one of each kind of chromosomes are described by the term
A) polyploid B) diploid C) triploid D) haploid
Glucose is found in glomerular filtrate but NOT in the urine because
A. glucose is converted to amino acids in the kidney. B. kidney cells require glucose because energy is needed for active transport. C. glucose molecules are too large to pass through the loop of the nephron (loop of Henle). D. glucose is reabsorbed back into the bloodstream. E. the kidney stores glucose as glycogen.